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SM8136A Datasheet(PDF) 6 Page - Nippon Precision Circuits Inc |
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SM8136A Datasheet(HTML) 6 Page - Nippon Precision Circuits Inc |
6 / 15 page SM8136A SEIKO NPC CORPORATION —6 VOUT Output Circuit Mode Switching The SM8136A output mode switches between 3 operating modes in response to the operating conditions. The modes are: standby mode, ×1.0 mode (VIN through mode), and ×1.5 mode (1.5-times charge pump boost). The VOUT output switches automatically between these modes in response to the drive LED characteristics and the overall power consumption. Switching from ×1.0 mode to ×1.5 mode is controlled automatically by an internal circuit. The operating mode cannot be specified by an external control signal. Startup: Internal Reset Time and Soft Start Time The SM8136A normal startup procedure (after VIN has been applied previously) is to switch from standby mode to the ×1.0/×1.5 operating modes when the EN enable input goes HIGH. The soft start time (described on the following page) begins after switching to the operating mode using EN. (1) VIN is HIGH, EN is LOW (standby mode) (2) Switches to an operating mode when EN goes HIGH (soft start time begins) If the use at EN = VIN when power is applied, the startup commences after the power-ON reset (POR) time (approximately 50 µs) has elapsed. (1) When using at EN = VIN, rising time from 0.3V to 2.7V should set < 50 µs. (2) Power-ON reset (POR) circuit resets internal circuits approximately 50 µs after the power is applied. (3) If EN is HIGH when power is applied, the internal circuits start operating when the internal “CE” signal ris- ing edge occurs after the power-ON reset time. If EN is LOW when power is applied, the “CE” rising edge occurs simultaneously with the first rising edge. Normal startup Internal reset operation when power is applied (power-ON reset) Soft start time VIN EN VIN High ENABLE ON (1) (2) Standby mode EN = VIN 1.5 mode Internal power on reset Internal enable (CE) POR time typ: 50 µs (2) (3) Soft start time Standby mode (1) < 50 µs 0.3V 2.7V |
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